function getCookie(c_name)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=")
  if (c_start!=-1)
    { 
    c_start=c_start + c_name.length+1 
    c_end=document.cookie.indexOf(";",c_start)
    if (c_end==-1) c_end=document.cookie.length
    return unescape(document.cookie.substring(c_start,c_end))
    } 
  }
return ""
}

function setCookie(c_name,value,expiredays)
{
var exdate=new Date()
exdate.setDate(exdate.getDate()+expiredays)
document.cookie=c_name+ "=" +escape(value)+
((expiredays==null) ? "" : ";expires="+exdate.toGMTString())+";Path=/";
}

function checkCookie(){
 var user=getCookie('theuser')
 if (user!=null && user!=""){
	return user;
 }else {
	 return 0;//没有登录
//  if (username!=null && username!=""){
//    setCookie('username',username,365)
//    }
  }
}
function clearcookie(){  
var temp=document.cookie.split(";");  
var loop3;  
var ts;  
for (loop3=0;loop3<temp.length;loop3++){  
    ts=temp[loop3].split("=")[0];  
    if (ts.indexOf("theuser")!=-1)  
    	deletecookie(ts);     
    }   
}  
function deletecookie(name){  //删除名称为name的Cookie  
    var exp = new Date();    
    exp.setTime (exp.getTime() - 1);    
    var cval = getCookie(name);    
    document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString()+";Path=/";  
}  

